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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // 任意数组求和案例
      // function getsumArr(arr) {
      //   let sum = 0
      //   for (let i = 0; i < arr.legnth; i++) {
      //     sum + arr[i]
      //   }
      //   return sum
      // }
      // console.log(getsumArr([10, 20, 30, 40]))

      function getsumArr(arr) {
        let sum = 0
        for (let i = 0; i < arr.length; i++) {
          sum += arr[i]
        }
        return sum
      }
      console.log(getsumArr((arr = [10, 20, 30, 40])))
    </script>
  </body>
</html>
